I have a Dell Inspiron 620 that I would like to supercharge.
 
Inspiron 620
 
I currently have an i3 CPU/8gb ram and looked at upgrading the CPU to and i5 or i7. Most advised me that either it couldn't be done or that the increase in performance would be negligible. They cited BIOS and Chipset issues as well as power consumption current(s) that would be a deterrent to using the existing MB.

So with a budget of around 600 bucks for a new MB/CPU, what can I do to set this 4 year old Dell on fire and increase all around performance? I'm looking to improve my box for improvement in the gaming arena.

thanks in advance,

pclaptop